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Werkzeug originally had a magical import system hook that enabled
everything to be imported from one module and still loading the actual
implementations lazily as necessary. Unfortunately this turned out to be
slow and also unreliable on alternative Python implementations and
Google’s App Engine.

Starting with 0.7 we recommend against the short imports and strongly
encourage starting importing from the actual implementation module.
Werkzeug 1.0 will disable the magical import hook completely.

Because finding out where the actual functions are imported and rewriting
them by hand is a painful and boring process we wrote a tool that aids in
making this transition.

For instance, with Werkzeug < 0.7 the recommended way to use the escape function
was this:

fromwerkzeugimportescape

With Werkzeug 0.7, the recommended way to import this function is
directly from the utils module (and with 1.0 this will become mandatory).
To automatically rewrite all imports one can use the
werkzeug-import-rewrite script.

You can use it by executing it with Python and with a list of folders with
Werkzeug based code. It will then spit out a hg/git compatible patch
file. Example patch file creation: